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/*************************************************************************
* Copyright (C) 2009-2014 Tavian Barnes <tavianator@tavianator.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension Library is free software; you can redistribute it and/ *
* or modify it under the terms of the GNU Lesser General Public License *
* as published by the Free Software Foundation; either version 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension Library is distributed in the hope that it will be *
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty *
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
/**
* @file
* Lights.
*/
#include <stdbool.h>
/* Forward-declar dmnsn_light */
typedef struct dmnsn_light dmnsn_light;
/**
* Light direction callback.
* @param[in] light The light itself.
* @param[in] v The point to illuminate.
* @return The direction of light rays pointing from \p v
*/
typedef dmnsn_vector dmnsn_light_direction_fn(const dmnsn_light *light,
dmnsn_vector v);
/**
* Light illumination callback.
* @param[in] light The light itself.
* @param[in] v The point to illuminate.
* @return The color of the light at \p v.
*/
typedef dmnsn_color dmnsn_light_illumination_fn(const dmnsn_light *light,
dmnsn_vector v);
/**
* Light shadow callback.
* @param[in] light The light itself.
* @param[in] t The line index of the closest shadow ray intersection.
* @return Whether the point is in shadow.
*/
typedef bool dmnsn_light_shadow_fn(const dmnsn_light *light, double t);
/**
* Light destruction callback.
* @param[in,out] light The light to free.
*/
typedef void dmnsn_light_free_fn(dmnsn_light *light);
/** A light. */
struct dmnsn_light {
/* Callbacks */
dmnsn_light_direction_fn *direction_fn; /**< Direction callback. */
dmnsn_light_illumination_fn *illumination_fn; /**< Illumination callback. */
dmnsn_light_shadow_fn *shadow_fn; /**< Shadow callback. */
dmnsn_light_free_fn *free_fn; /**< Desctructor callback. */
DMNSN_REFCOUNT; /**< Reference count. */
};
/**
* Create a dummy light.
* @return The allocated light.
*/
dmnsn_light *dmnsn_new_light(void);
/**
* Initialize a dmnsn_light field.
* @param[out] light The light to initialize.
*/
void dmnsn_init_light(dmnsn_light *light);
/**
* Delete a light.
* @param[in,out] light The light to delete.
*/
void dmnsn_delete_light(dmnsn_light *light);
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